Questions
Radius of a wire is 2.50 mm. The length of the wire is 50.0 cm If mass of wire was measured as 25 g, then find the density of wire in correct significant figures. Given, , exact
a
2.2 g/cm3
b
2.9 g/cm3
c
2.1 g/cm3
d
2.5 g/cm3
detailed solution
Correct option is D
Given, r = 2.50 mmr = 0.250 cmFurther given that,l=50.0 cmm=25 gπ=3.14 exactρ=mV=mπr2l=25(3.14)(0.250)(0.250)(50.0)=2.5477 g/cm3But in the measured values, least number of significant figures are two. Hence, we will round off the result to two significant figures.ρ=2.5 g/cm3Talk to our academic expert!
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